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Fuel Sending Unit question!

 
Old 12-07-2018, 06:01 PM
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Default Fuel Sending Unit question!

OK! My gas gauge bit the dust over the Summer. So I'm planning on having the car repaired this winter. The catch is I'm torn between having the whole Sending Unit replaced or just replacing Fuel Float and arm assembly. Of course the Arm is a lot cheaper but I'm thinking I should replace the whole unit to be safe. Have any of you guys replaced just the Arm and Float?
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Old 12-07-2018, 06:41 PM
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I would replace all of those parts while the car is apart, it is a major job dropping the tank(s) especially if the car is an auto tranny, why go through that effort again?
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Old 12-07-2018, 06:52 PM
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Originally Posted by 449er View Post
I would replace all of those parts while the car is apart, it is a major job dropping the tank(s) especially if the car is an auto tranny, why go through that effort again?
That's what I was thinking! With my luck a week later the Fuel Pump will die........
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Old 12-07-2018, 07:01 PM
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Originally Posted by 449er View Post
I would replace all of those parts while the car is apart, it is a major job dropping the tank(s) especially if the car is an auto tranny, why go through that effort again?
Yup, a no-brainer for me, if (when) the time comes.
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Old 12-07-2018, 07:06 PM
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Originally Posted by Gotta-Qik-C6 View Post
OK! My gas gauge bit the dust over the Summer. So I'm planning on having the car repaired this winter. The catch is I'm torn between having the whole Sending Unit replaced or just replacing Fuel Float and arm assembly. Of course the Arm is a lot cheaper but I'm thinking I should replace the whole unit to be safe. Have any of you guys replaced just the Arm and Float?
(I presume by "sending unit" you mean the pump module, and by "fuel float and arm assembly" you mean just the fuel level sender.)

Personally I'd change the entire left side module (with the electric pump and the crack-prone fitting on top) and probably just the sender on the right side.

Plus every single hose and fitting inside the crossover tube. They can get stuck over time and damaged during disassembly. Better to plan on replacing them from the get-go.
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Old 12-07-2018, 07:24 PM
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Have you tried adding a can of Techron to the tank first? It has been known to fix this problem.
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Old 12-07-2018, 08:02 PM
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Originally Posted by torquetube View Post
(I presume by "sending unit" you mean the pump module, and by "fuel float and arm assembly" you mean just the fuel level sender.)

Personally I'd change the entire left side module (with the electric pump and the crack-prone fitting on top) and probably just the sender on the right side.

Plus every single hose and fitting inside the crossover tube. They can get stuck over time and damaged during disassembly. Better to plan on replacing them from the get-go.
OK Thanks! That's good to know!
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Old 12-07-2018, 08:03 PM
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Originally Posted by EVRose View Post
Have you tried adding a can of Techron to the tank first? It has been known to fix this problem.
Yeah I tried that! It didn't help at all.......
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Old 12-08-2018, 08:20 AM
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Do another one---can't hurt, might work. Sometimes it takes more than once to work.

And for all---See This--Believe or Not: https://www.corvetteforum.com/forums...in-winter.html

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Old 12-19-2018, 09:44 AM
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Techron probably won't fix it. Take a look at this video to understand why.

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Old 02-27-2019, 12:40 AM
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Default Save your money-Skip the Techron for the right fuel tank sender

I think there is a Techron salesperson in these forums leaving comments everywhere. My gas gauge doesn't work-Use Techron; I have a squeak in my engine-Use Techron; my engine overheated-Use Techron; my tire went flat-Use Techron!

Save your money and skip the Techron to fix problems with the right fuel tank sender on a C6 (unless you can add pixie dust from the left ******** of a pink unicorn to the Techron).

The problem has nothing to do with a dirty or corroded sensor, but a broken sensor, something Techron cannot fix (unless you have the pixie dust).

Imagine this: Let's assume your car get 27mpg on the highway as advertised by GM. You start a road trip on the highway with both fuel tanks full. For the first 243 miles (9 gallons multiplied by 27mpg), every time you hit a bump or pothole on the highway, the shock to the fuel senders in both tanks is absorbed by the gas sloshing around in the tank. (Just like shaking a bottle FULL of water with a coin in it).

Then at 244 miles the right tank is empty and the left tank is full. Now every you hit a bump or pothole, the shock to the fuel sender in the left tank is absorbed by the gas, while the shock in the right tank is absorbed by the plastic and potentiometer holding the sensor arm. (Imagine shaking an empty bottle with a coin in I-rattle rattle rattlet). Unless you have a way to jam the Techron bottle into the right tank to keep the sender arm from rattling every time you hit a bump or pothole, the sender is on borrowed time.

The key to long life on the right tank fuel level sender is to never drive the car with an empty right tank. This will use the gas to protect the sensor from road shock much like the coin in a full bottle of water.

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Old 02-27-2019, 01:12 AM
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I hear Yak **** works if Techron is not available.....
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Old 02-27-2019, 02:06 AM
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LOL!! Especially if it comes from an albino Yak from the mountains of southern Peru
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Old 02-27-2019, 08:06 AM
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You guys spelling Yak with a capital "Y" shows that you have great respect for them!
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Old 02-27-2019, 09:33 AM
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Originally Posted by C6ToGo View Post
You guys spelling Yak with a capital "Y" shows that you have great respect for them!
Do female Yaks yak a lot?
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Old 02-27-2019, 10:08 AM
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Having done this job myself, you’ll soon realize that you won’t want to do it again. Replace both and even the the two small tubes that connect to the cross over tube.
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Old 02-27-2019, 04:26 PM
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Hmmm. Techron worked for me just fine. Saved me a bunch of cash. My builder / tuner recommended we try it before he pulled the tank. And yes.. he did sell me the bottle of Techron! Hahaha
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Old 02-27-2019, 11:18 PM
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Originally Posted by Bruze View Post
Do female Yaks yak a lot?
Yak off, old man! ;P
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Old 02-27-2019, 11:35 PM
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Originally Posted by owc6 View Post
Yak off, old man! ;P



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Old 02-28-2019, 01:36 PM
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Techron won't fix it. Take a look at the wiper arms on the sending unit I pulled out of my passenger side tank. No amount of fuel cleaner is going to fix this. And by the way, don't just replace the float, because what fails on them is the sending unit itself, not the float. If you just replace the float arm, you're wasting your time.



Last edited by CSixDude; 02-28-2019 at 01:37 PM.
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